Scaling and final-state interactions in deep-inelastic neutron scattering

Sears, V. F.

doi:10.1103/physrevb.30.44

Cited by 278 publications

(271 citation statements)

References 68 publications

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“…26 On the contrary in this paper we have shown ͑see Sec. IV͒ that the contribution coming from the 1/q 2 term, although small, in general can not be negligible.…”

Section: Discussionmentioning

confidence: 45%

“…In particular an important question is the size and functional form of these deviations occurring at finite q. Various procedures have been proposed in the literature, [25][26][27][28] in order to cope with these deviations, for instance, Sears 26 suggested removing the antisymmetric part of these contributions by simply symmetrizing the data about yϭ0. However, a model-independent framework for a description of DINS in molecular systems is still needed which is also able to cope with the scattering process at finite q.…”

Section: Introductionmentioning

confidence: 99%

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Model-independent analysis of inelastic-neutron-scattering data at high momentum transfer

1996

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A model-independent procedure is proposed which allows us to obtain the asymptotic scaling function at infinite momentum transfer and a comprehensive assessment of deviations of deep inelastic-neutron-scattering data from a perfect scaling behavior, which are due to the finite values of energy and momentum transfers to the target atom. The procedure is applied to simulated and experimental data on polycrystalline ZrH 2 at Tϭ20 and 290 K. We observe that the impulse approximation, valid for infinite energy and momentum transfers, is not yet completely reached at the finite momentum transfer values q of neutron experiments even at qӍ60 Å Ϫ1 . It is argued that, beyond the specific case of ZrH 2 , this procedure can be used for the description of deep inelastic-neutron scattering from other molecular and atomic systems.

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“…26 On the contrary in this paper we have shown ͑see Sec. IV͒ that the contribution coming from the 1/q 2 term, although small, in general can not be negligible.…”

Section: Discussionmentioning

confidence: 45%

Section: Introductionmentioning

confidence: 99%

Model-independent analysis of inelastic-neutron-scattering data at high momentum transfer

1996

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“…Typically, the scattering data is presented and analyzed in terms of the West scaling variable Y and the neutron Compton profile J(Y, Q) 54 . These quantities are defined as follows:…”

Section: Impulse Approximationmentioning

confidence: 99%

The Momentum Distribution of Liquid $$^4\hbox {He}$$

et al. 2017

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We report high-resolution neutron Compton scattering measurements of liquid 4 He under saturated vapor pressure. There is excellent agreement between the observed scattering and ab initio predictions of its lineshape. Quantum Monte Carlo calculations predict that the Bose condensate fraction is zero in the normal fluid, builds up rapidly just below the superfluid transition temperature, and reaches a value of approximately 7.5% below 1 K. We also used model fit functions to obtain from the scattering data empirical estimates for the average atomic kinetic energy and Bose condensate fraction. These quantities are also in excellent agreement with ab initio calculations.The convergence between the scattering data and Quantum Monte Carlo calculations is strong evidence for a Bose broken symmetry in superfluid 4 He. 1 arXiv:1703.03018v1 [cond-mat.other]

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“…We consider below a method which has extensively been applied in the past 30 before the rediscovery of the 1/q GRS expansion of the response ͑4a͒. 15 Recently it has been brought to the fore again in an attempt to parametrize data without the intervention of a theory.…”

Section: Cumulant Expansions Of the Responsementioning

confidence: 99%

Large-qneutron inclusive-scattering data from liquid4He

et al. 1998

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We report dynamical calculations for large-q structure functions of liquid 4 He at Tϭ1.6 and 2.3 K and compare those with recent MARI data. We extend those calculations far beyond the experimental range qр29 Å Ϫ1 in order to study the approach of the response to its asymptotic limit for a system with interactions having a strong short-range repulsion. We find only small deviations from theoretical 1/q behavior, valid for smooth V. We repeat an extraction by Glyde et al. of cumulant coefficients from data which are invariably very well reproduced. We argue that fits determine the single atom momentum distribution, but express doubt as to the extraction of meaningful final state interaction parameters. ͓S0163-1829͑98͒02709-X͔

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Scaling and final-state interactions in deep-inelastic neutron scattering

Cited by 278 publications

References 68 publications

Model-independent analysis of inelastic-neutron-scattering data at high momentum transfer

Model-independent analysis of inelastic-neutron-scattering data at high momentum transfer

The Momentum Distribution of Liquid $$^4\hbox {He}$$

Large-qneutron inclusive-scattering data from liquid4He

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